A magnetic disk control apparatus is capable of reducing the overall length of synchronization fields in split sectors and hence capable of increasing the storage capacity for data fields. The apparatus records data for each sector in such a manner that when a servo field is present in a sector, the sector is split into a first split sector and a second split sector each including a synchronization field and a data field. The apparatus has a storage medium, a head, a mechanical section that controls the relative position of the storage medium and the head, a hard disk controller that controls write timing and read timing, and a read channel that modulates and writes a synchronization field and a data field according to the write timing, performs phase synchronization and frequency synchronization based on the synchronization field read according to the read timing, and demodulates the data field according to the obtained phase and frequency. The synchronization field of each second split sector has a length required only for phase synchronization.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A magnetic disk control apparatus for recording data for each sector on a magnetic disk in such a manner that when a servo field is present in a sector including a synchronization field and a data field, said sector is split into a first split sector and a second split sector each including a synchronization field and a data field, said apparatus comprising: a first synchronization field forming section that forms said synchronization field in said first split sector; and a second synchronization field forming section that forms said synchronization field shorter than that of said first split sector in said second split sector, wherein said first synchronization field forming section forms a phase synchronization field capable of phase synchronization and a phase frequency synchronization field capable of phase frequency synchronization as said synchronization field, and said second synchronization field forming section forms a phase synchronization field capable of phase synchronization as said synchronization field; said apparatus further comprising: a phase frequency information storage section that reads and stores, when data recorded on the magnetic disk is read, phase frequency information from the phase frequency synchronization field formed by said first synchronization field forming section so as to use the phase frequency information as phase frequency synchronization information for reading data from said second split sector.
2. A magnetic disk control method for recording data for each sector on a magnetic disk in such a manner that when a servo field is present in a sector including a synchronization field and a data field, said sector is split into a first split sector and a second split sector each including a synchronization field and a data field, said method comprising, for recording data on the magnetic disk; a first split sector forming step of forming a data field after forming said synchronization field as said first split sector; and a second split sector forming step of forming a data field after forming said synchronization field shorter than that of said first split sector as said second split sector, wherein, in said first split sector forming step, said data field is formed after a phase synchronization field capable of phase synchronization and a phase frequency synchronization field capable of phase frequency synchronization are formed as said synchronization field, wherein, in said second split sector forming step, said data field is formed after a phase synchronization field capable of phase synchronization is formed as said synchronization field, said method further comprising, for reading data from the magnetic disk: a first split sector reading step of reading phase information from the phase synchronization field in said first split sector and phase frequency information from the phase frequency synchronization field in said first split sector and reading data from the data field in said first split sector; and a second split sector reading step of reading phase information from the phase synchronization field in the second split sector and reading data from the data field in the second split sector by using the phase information read from the phase synchronization field in said second split sector and the phase frequency information read from the phase frequency synchronization field in said first split sector.
3. A magnetic disk control program for instructing a computer to execute a magnetic disk control method for recording data for each sector on a magnetic disk in such a manner that when a servo field is present in a sector including a synchronization field and a data field, said sector is split into a first split sector and a second split sector each including a synchronization field and a data field, said program instructing the computer to execute, when recording data on the magnetic disk: a first split sector forming step of forming a data field after forming said synchronization field as said first split sector; and a second split sector forming step of forming a data field after forming said synchronization field shorter than that of said first split sector as said second split sector, wherein, in said first split sector forming step, said data field is formed after a phase synchronization field capable of phase synchronization and a phase frequency synchronization field capable of phase frequency synchronization are formed, wherein, in said second split sector forming step, said data field is formed after a phase synchronization field capable of phase synchronization is formed; said program further instructing the computer to execute, when reading data from the magnetic disk: a first split sector reading step of reading phase information from the phase synchronization field in said first split sector and phase frequency information from the phase frequency synchronization field in said first split sector and reading data from the data field in said first split sector; and a second split sector reading step of reading phase information from the phase synchronization field in said second split sector and reading data from the data field in said second split sector by using the phase information read from the phase synchronization field in said second split sector and the phase frequency information read from the phase frequency synchronization field in said first split sector.
4. A magnetic disk having data for each sector recorded thereon in such a manner that when a servo field is present in a sector including a synchronization field and a data field, said sector is split into a first split sector and a second split sector each including a synchronization field and a data field, wherein, in said first split sector, said synchronization field is formed, and a data field is formed following said synchronization field, wherein, in said second split sector, said synchronization field shorter than that of in said first split sector is formed, and a data field is formed following said synchronization field, wherein, in said first split sector, a phase synchronization field for a phase synchronization information and a phase frequency synchronization field for a phase frequency synchronization information are formed as said synchronization field, and a data field is formed following said phase frequency synchronization field, wherein, in said second split sector, a phase synchronization field is formed as said synchronization field, and a data field is formed following said phase synchronization field, wherein said phase frequency synchronization information in said phase frequency synchronization field can be used as a phase frequency synchronization information for reading data from the second split sector.
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February 12, 2004
September 19, 2006
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